Avatar of mmalik15
 asked on

how to fix "Mailbox unavailable. The server resposne was: 5.7.1....."

on a form submission  we are getting the following (Also attached screenshot) message.

MailBox unavailable. The server response was:5.7.1.... See attached image for details. Any solutions?

we are using IIS 6 in windows 2003 server
ASP.NETEmail ProtocolsC#

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Last Comment
Rose Babu

8/22/2022 - Mon
Manpreet SIngh Khatra

Is this some kind of Application trying to relay data through some Email server ?
Was there some changes to server or application ? was it working earlier ?

- Rancy
Rose Babu

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